Version: 2.6

Configure system users

Adjust the system user or group for each LiveData Migrator service to suit your environment.

info

Data Migrator 1.20 changed Hive Migrator user configuration. If upgrading to 1.21, and authenticating with Hive through a Kerberos principal that doesn't map to the hive user, ensure there's a valid proxy user setting in core-site.xml. Otherwise metadata migrations will fail. See the known issue for more information.

Defaults

The default system users and groups for each service are as follows:

Service	Default system user	Default system group
`livedata-migrator`	`hdfs`	`hdfs`
`livedata-migrator-data-agent`	`hdfs`	`hdfs`
`livedata-ui`	`hdfs`	`hdfs`
`hivemigrator`	`hive`	`hadoop`
`hivemigrator-remote-server`	`hive`	`hadoop`

If you assign a customer user and group during installation, the above default system users and groups will be overwritten.

Running a service as a different user or group

You can run a service your own custom user or group, allowing precise control over privileges are provided. However, this is only appropriate in environments not running Kerberos:

Customer service users without Kerberos

Running without Kerberos

Don't run Data Migrator without Kerberos in production environments. We recommend running without Kerberos for internal testing only.

Customer service users with Kerberos

Running with Kerberos

On a kerberized cluster, the principal set in the Kerberos keytab determines the identity used to grant access to the source and target. As a result, you don't need to run services using a privileged user. You can set up a custom user with fewer privileges to increase cluster security.

Follow the steps below, depending on which service user/group you want to change.

Data Migrator and UI

Adjust the system user or group in the service configuration.

Only do this step if running a Linux distribution with systemd
Create an override service file for the following services:
Data Migrator
```
systemctl edit livedata-migrator
```
Data Transfer Agent
```
systemctl edit livedata-migrator-data-agent
```
UI
```
systemctl edit livedata-ui
```
In the text editor that opens automatically, override the User and Group variables with your preferred user and group:
Example
```
[Service]
User=<user>
Group=<group>
```
Update the values for USERNAME and GROUPNAME in the configuration file for the following services:
Data Migrator
```
/etc/wandisco/livedata-migrator/vars.env
```
Data Transfer Agent
```
/etc/wandisco/livedata-migrator-data-agent/vars.env
```
UI
```
/etc/wandisco/ui/vars.env
```

Change ownership of the related directories to the new system user/group:

Data Migrator

chown -R <user>:<group> /opt/wandisco/livedata-migrator /etc/wandisco/livedata-migrator /var/log/wandisco/livedata-migrator /var/run/livedata-migrator

Data Transfer Agent

chown -R <user>:<group> /opt/wandisco/livedata-migrator-data-agent /etc/wandisco/livedata-migrator-data-agent /var/log/wandisco/livedata-migrator-data-agent /var/run/livedata-migrator-data-agent

chown -R <user>:<group> /opt/wandisco/ui /etc/wandisco/ui /var/log/wandisco/ui /var/run/livedata-ui /var/log/wandisco/audit

After you've made changes, restart the services:

Hive Migrator and Hive Migrator remote server

Adjust the system user or group in the service configuration.

Only do this step if running a Linux distribution with systemd
Create an override service file for the following services:
Hive Migrator
```
systemctl edit hivemigrator
```
Hive Migrator remote server
```
systemctl edit hivemigrator-remote-server
```
In the text editor that opens automatically, override the User and Group variables with your preferred user and group:
Example
```
[Service]
User=<user>
Group=<group>
```
Update the values for HIVE_MIGRATOR_SERVER_USER and HIVE_MIGRATOR_SERVER_GROUP in the configuration file for the following services:
Hive Migrator
```
/etc/wandisco/hivemigrator/vars.sh
```
Hive Migrator remote server
```
/etc/wandisco/hivemigrator-remote-server/vars.sh
```

Change ownership of the related directories to the new system user/group:

Hive Migrator

chown -R <user>:<group> /opt/wandisco/hivemigrator /etc/wandisco/hivemigrator /var/log/wandisco/hivemigrator /var/run/hivemigrator

Hive Migrator remote server

chown -R <user>:<group> /opt/wandisco/hivemigrator-remote-server /etc/wandisco/hivemigrator-remote-server /var/log/wandisco/hivemigrator-remote-server /var/run/hivemigrator-remote-server

Once you've finished making changes, restart the corresponding services:

Defaults​

Running a service as a different user or group​

Customer service users without Kerberos​

Customer service users with Kerberos​

Data Migrator and UI​

Hive Migrator and Hive Migrator remote server​